<script lang="ts" setup name="XtxCarousel">
import { defineProps, onMounted, onUnmounted, ref } from 'vue'
// 轮播图类型
export type bannerType = {
  id: string;
  imgUrl: string;
  hrefUrl: string;
  type: string;
}
const { bannerList, AutoPlay=false, direction=3000 } = defineProps<{
  bannerList: bannerType[]
  AutoPlay?:Boolean
  direction?:number
}>()


// 轮播图选中
const active = ref(0)
let timerId = -1
// 上一张
const prev = () => {
  active.value--
  if(active.value < 0) active.value = bannerList.length - 1
}
// 下一张
const next = () => {
  active.value++
  if(active.value === bannerList.length) active.value = 0
}
console.log(AutoPlay);
// 开启轮播图
const start = () => {
  if(!AutoPlay) return
  timerId = window.setInterval(()=>{
    next()
  },direction)
}
// 停止
const stop = () => {
  clearInterval(timerId)
}
// 点击span按钮切换当前图片
const changeNow = (i:number) => {
  active.value = i
}
onMounted(() => {
  start()
})

onUnmounted(() => {
  stop()
})
</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop()" @mouseleave="start()">
    <ul class="carousel-body" >
      <li  v-for="(ele,index) in bannerList" :key="ele.id" class="carousel-item" :class="{fade : index === active }">
        <RouterLink to="/">
          <img
            :src="ele.imgUrl"
            alt=""
          />
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev"
      ><i class="iconfont icon-angle-left" @click="prev"></i
    ></a>
    <a href="javascript:;" class="carousel-btn next"
      ><i class="iconfont icon-angle-right" @click="next"></i
    ></a>
    <div class="carousel-indicator">
      <span @click="changeNow(index)" v-for="(ele,index) in bannerList" :key="ele.id" :class="{active: index === active }"></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1; // 1：显示 0：不显示
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>